| {{B}}One Good Reason to Let
Smallpox Live{{/B}} It’s now a fair bet that we will never see the total extinction(灭绝)of the smallpox(天花)virus. When smallpox was completely got rid of in the world,scientists wanted to {{U}} (51) {{/U}}the killer virus in the last two labs -- one in the US and one in Russia. They asked:If smallpox has truly gone from the planet,{{U}} (52) {{/U}}point was there in keeping these reserves In reality,of course,it was naive to{{U}} (53) {{/U}}that everyone would let go of such a powerful potential weapon. Undoubtedly several nations still have{{U}} (54) {{/U}} vials(小药瓶). And the last "official" stocks of live Virus bred mistrust of the US and Russia,{{U}} (55) {{/U}}no obvious gain. Now American researchers have{{U}} (56) {{/U}} an ani A. adopts B. rejects C. suggests D. introduces 更多"下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 "的相关试题: [单项选择] 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。
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